You’ve seen her in “Erin Brokovich,” the “Amateurs,” “Christmas with the Kranks” and “I Shot Andy Warhol.” Let’s not forget about the TV series “Hart of Dixie” and “Pretty Little Liars.” Step back a few years and you would have seen her on stage at the Wilbur Theatre in the Tony Award-winning revival of “All My Sons.” But if you met her on the street you’d probably slow down and say to yourself “Where do I know her from?”